/*
 * Copyright 2011 Philippe Blanc.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
package me.l1k3.ui.client;

import me.l1k3.ui.client.inter.DirectFileUploadListener;

import com.google.gwt.dom.client.InputElement;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteEvent;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteHandler;

public class DirectFileUpload extends FileUpload {
    private FormPanel form;
    private HandlerRegistration registration;
    private DirectFileUploadListener listener;

    public DirectFileUpload(FormPanel form) {
        super();

        this.form = form;

        form.addSubmitCompleteHandler(new SubmitCompleteHandler() {
            public void onSubmitComplete(SubmitCompleteEvent event) {
                getInputElement().setValue("");
                listener.endDirectFileUpload(event.getResults());
            }
        });
    }

    public void setDirectFileUploadListener(DirectFileUploadListener listener) {
        this.listener = listener;
    }

    private InputElement getInputElement() {
        return getElement().cast();
    }

    @Override
    protected void onLoad() {
        super.onLoad();

        registration = addDomHandler(new ChangeHandler() {
            public void onChange(ChangeEvent event) {
                listener.startDirectFileUpload();
                form.submit();
            }
        }, ChangeEvent.getType());
    }

    @Override
    protected void onUnload() {
        super.onUnload();

        registration.removeHandler();
        registration = null;
    }
}
